Blazor TextArea Overview

The Telerik Blazor TextArea component is a highly customizable multi-line text input area. It provides features like auto resizing based on the user input and events to respond to user actions.

The TextArea component is part of Telerik UI for Blazor, a professional grade UI library with 110+ native components for building modern and feature-rich applications. To try it out sign up for a free 30-day trial.

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Creating Blazor TextArea

1. Add the <TelerikTextArea> tag to a Razor file.
2. Set the Value parameter to a string object. It supports one-way and two-way binding.
3. (optional) Set the AutoSize property to adjust the TextArea height based on the user input.
4. (optional) Set the MaxLength property to control the maximum amount of characters that the user can type in the component.

Basic TextArea with two-way value binding

<TelerikTextArea @bind-Value="@TextAreaValue"
                 AutoSize="true" 
                 MaxLength="200" />

<p>TextArea value: @TextAreaValue</p>

@code {
    public string TextAreaValue { get; set; }
}

Appearance

The TextArea component provides settings to control its appearance. Read more about the Blazor TextArea appearance settings.

To learn more about the appearance, anatomy, and accessibility of the TextArea, visit the Progress Design System documentation—an information portal offering rich component usage guidelines, descriptions of the available style variables, and globalization support details.

Adornments

The component allows you to add custom elements as prefixes and suffixes. Read more about how to render custom adornments before and after the input element...

Events

The Blazor TextArea fires blur and value change events to respond to user actions. Read more about the Blazor TextArea events.

TextArea Parameters

The Blazor TextArea provides various parameters to configure the component:

Parameter	Type and Default Value	Description
AutoCapitalize	string	A string that maps to the autocapitalize attribute of the HTML element. It's applicable only for touch devices and virtual keyboards.
AutoComplete	bool	Maps to the autocomplete attribute of the HTML <textarea>.
AutoSize	bool	Specifies if the TextArea will adjust its height based on the user input. You can use CSS to limit the resizing up to a max height. This parameter will be deprecated in a future version. Use ResizeMode with Auto value instead.
ResizeMode	TextAreaResizeMode?	Specifies the TextArea's resize behavior. Default behavior is the one set by the browser.
Class	string	The custom CSS class to be rendered on the <span class="k-textarea"> element.
Cols	int?	Maps to the cols attribute of the HTML <textarea> element. Do not use together with Width.
DebounceDelay	int	Specifies the time in milliseconds between the last typed symbol and the updating of the value. The default value is 150ms.
Enabled	bool true	Whether the TextArea is enabled.
ReadOnly	bool	If set to true, the component will be readonly and will not allow user input. The component is not readonly by default and allows user input.
Id	string	Renders as the id attribute on the <textarea> element, so you can attach a <label for="">.
MaxLength	int?	Maps to the maxlength attribute of the HTML <textarea> element.
Name	string	The name attribute of the HTML element. It is usually required so the AutoComplete will be honored by the browser.
Placeholder	string	A string that maps to the placeholder attribute of the HTML element. If a Label is defined, it will be shown instead of the placeholder when the input is not focused.
Rows	int?	Maps to the rows attribute of the HTML <textarea> element.
SpellCheck	string	A string that maps to the spellcheck attribute of the HTML element. Use it to disable browser spellchecking if it's intrusive to the user or due to privacy and security concerns.
TabIndex	Nullable<int>	Maps to the tabindex attribute of the HTML element. You can use it to customize the order in which the inputs in your form focus with the Tab key.
Title	string	Maps to the title attribute of the HTML element. You can use it to add a tooltip.
ValidateOn	ValidationEvent enum (Input)	Configures the event that will trigger validation (if validation is enabled). Read more at Validation Modes for Simple Inputs.
Value	string	The value of the component. Supports two-way binding.
Width	string	The component width. See Dimensions. The Width parameter has no default value, but the theme applies a width: 100% style. Do not use together with Cols.

See the Input Validation article.

TextArea Reference and Methods

The TextArea provides a FocusAsync method that allows the application to focus the component programmatically. First, obtain reference to the component through its @ref attribute. Also check the dedicated KB article about programmatic input component focusing, which provides more examples and tips.

Use TextArea methods

<TelerikButton OnClick="@FocusTextArea">Focus TextArea</TelerikButton>

<TelerikTextArea @ref="@TextAreaRef"
                 @bind-Value="@TextAreaValue"
                 Width="200px" />

@code {
    private TelerikTextArea TextAreaRef { get; set; }

    private string TextAreaValue { get; set; }

    async Task FocusTextArea()
    {
        await TextAreaRef.FocusAsync();
    }
}

Next Steps

• Handle the TextArea Events
• Explore the TextArea Appearance Settings

See Also

• Live TextArea Demos
• TextArea API Reference